/* ==========================================================================
   YADNYESH CHAUDHARI — PORTFOLIO
   Design tokens: deep navy base, azure + mint accents, technical type pairing
   ========================================================================== */

:root {
  /* Color */
  --bg:            #0B1220;
  --bg-soft:       #0E1727;
  --surface:       #101B2E;
  --surface-2:     #16233D;
  --border:        rgba(140, 168, 210, 0.14);
  --border-strong: rgba(140, 168, 210, 0.28);

  --accent:        #4C9EFF;
  --accent-dim:    #2E6FC2;
  --accent-2:      #7DE0C4;

  --text:          #E9EFF8;
  --text-muted:    #93A6C4;
  --text-faint:    #5E6E8C;

  --danger:        #FF6B6B;
  --success:       #7DE0C4;

  /* Type */
  --font-display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body:    'Inter', 'Segoe UI', sans-serif;
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;

  /* Layout */
  --max-width: 1180px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --section-pad: 120px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ============ Reset ============ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; margin: 0; padding: 0; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }
h1, h2, h3 { font-family: var(--font-display); margin: 0; }
p { margin: 0; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============ Background texture ============ */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 900px 500px at 15% -10%, rgba(76,158,255,0.14), transparent 60%),
    radial-gradient(ellipse 700px 500px at 100% 20%, rgba(125,224,196,0.08), transparent 60%),
    var(--bg);
}

/* ============================================================
   PAGE LOADER
============================================================= */
.loader {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s var(--ease), visibility 0.6s var(--ease);
}
.loader.loader--hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.loader__prompt {
  font-family: var(--font-mono);
  color: var(--accent-2);
  font-size: 1.1rem;
}
.loader__cursor { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ============================================================
   NAVIGATION
============================================================= */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(11, 18, 32, 0.55);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.nav.nav--scrolled {
  border-bottom-color: var(--border);
  background: rgba(11, 18, 32, 0.85);
}
.nav__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
}
.nav__dot { color: var(--accent); }
.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}
.nav__link {
  font-size: 0.92rem;
  color: var(--text-muted);
  position: relative;
  transition: color 0.2s var(--ease);
}
.nav__link:hover { color: var(--text); }
.nav__link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width 0.25s var(--ease);
}
.nav__link:hover::after { width: 100%; }
.nav__link--cta {
  color: var(--accent-2);
  border: 1px solid rgba(125,224,196,0.4);
  padding: 8px 16px;
  border-radius: 999px;
}
.nav__link--cta::after { display: none; }
.nav__link--cta:hover { background: rgba(125,224,196,0.1); color: var(--accent-2); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
}
.nav__toggle span {
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.25s var(--ease), opacity 0.25s var(--ease);
}

/* ============================================================
   BUTTONS
============================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
  white-space: nowrap;
}
.btn--primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  color: #061021;
  font-weight: 600;
  box-shadow: 0 8px 24px -8px rgba(76,158,255,0.55);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 12px 30px -8px rgba(76,158,255,0.7); }
.btn--ghost {
  border: 1px solid var(--border-strong);
  color: var(--text);
  background: rgba(255,255,255,0.02);
}
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }

/* ============================================================
   GLASS CARD
============================================================= */
.glass-card {
  background: linear-gradient(160deg, rgba(255,255,255,0.045), rgba(255,255,255,0.015));
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.glass-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: 0 20px 40px -20px rgba(0,0,0,0.6);
}

/* ============================================================
   HERO
============================================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 140px 32px 80px;
  overflow: hidden;
}
.hero__bg { position: absolute; inset: 0; z-index: 0; }
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(140,168,210,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(140,168,210,0.06) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, black, transparent);
}
.hero__glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
}
.hero__glow--a { width: 480px; height: 480px; background: var(--accent); top: -140px; left: -100px; animation: drift 14s ease-in-out infinite alternate; }
.hero__glow--b { width: 380px; height: 380px; background: var(--accent-2); bottom: -160px; right: -80px; opacity: 0.28; animation: drift 18s ease-in-out infinite alternate-reverse; }
@keyframes drift { from { transform: translate(0,0); } to { transform: translate(40px, 30px); } }

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 48px;
  align-items: center;
}
.hero__content { animation: rise 0.9s var(--ease) both; }
@keyframes rise { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }

.hero__eyebrow {
  font-family: var(--font-mono);
  color: var(--accent-2);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.hero__title {
  font-size: clamp(2.6rem, 5.5vw, 4.4rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff, #b9cbe8);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__role {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--accent);
  margin: 20px 0 24px;
  display: flex;
  gap: 10px;
}
.hero__role-prefix { color: var(--text-faint); }
.hero__role-cursor { animation: blink 1s step-end infinite; }
.hero__summary {
  max-width: 560px;
  color: var(--text-muted);
  font-size: 1.05rem;
  margin-bottom: 34px;
}
.hero__actions { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 30px; }
.hero__meta {
  font-size: 0.85rem;
  color: var(--text-faint);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.hero__meta a { color: var(--text-faint); transition: color 0.2s; }
.hero__meta a:hover { color: var(--accent-2); }
.hero__meta-sep { opacity: 0.5; }

.hero__portrait { display: flex; justify-content: center; animation: rise 1s var(--ease) 0.15s both; }
.hero__portrait-frame {
  position: relative;
  width: 240px; height: 240px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: radial-gradient(circle at 30% 30%, rgba(76,158,255,0.18), rgba(16,27,46,0.4));
}
.hero__portrait-svg { width: 80%; height: 80%; }
.hero__portrait-ring { fill: none; stroke: var(--border-strong); stroke-width: 1.5; stroke-dasharray: 4 6; }
.hero__portrait-fill { fill: var(--surface-2); stroke: var(--accent); stroke-width: 1.2; }
.hero__portrait-badge {
  position: absolute;
  bottom: 10px;
  background: var(--accent);
  color: #061021;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 5px 12px;
  border-radius: 999px;
  letter-spacing: 0.05em;
}

.scroll-cue {
  position: absolute;
  bottom: 36px; left: 50%;
  transform: translateX(-50%);
  width: 26px; height: 42px;
  border: 1.5px solid var(--border-strong);
  border-radius: 20px;
  z-index: 1;
}
.scroll-cue__line {
  position: absolute;
  top: 8px; left: 50%;
  width: 3px; height: 8px;
  background: var(--accent-2);
  border-radius: 2px;
  transform: translateX(-50%);
  animation: scrollDown 1.6s ease-in-out infinite;
}
@keyframes scrollDown { 0% { opacity: 1; top: 8px; } 70% { opacity: 0; top: 22px; } 100% { opacity: 0; top: 8px; } }

/* ============================================================
   SECTION SHELL
============================================================= */
.section { padding: var(--section-pad) 32px; position: relative; }
.section__inner { max-width: var(--max-width); margin: 0 auto; }
.section__eyebrow {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.section__title {
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
  font-weight: 600;
  max-width: 720px;
  margin-bottom: 56px;
  letter-spacing: -0.01em;
}

/* ============ Fade-in on scroll ============ */
.fade-in { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.fade-in.is-visible { opacity: 1; transform: translateY(0); }

/* ============================================================
   ABOUT
============================================================= */
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.about__text p { color: var(--text-muted); margin-bottom: 18px; font-size: 1.02rem; }
.about__cards { display: grid; gap: 18px; }
.about__card { padding: 24px; }
.about__card-title { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent-2); margin-bottom: 10px; }
.about__card-main { font-weight: 600; font-size: 1.05rem; margin-bottom: 4px; }
.about__card-sub { color: var(--text-muted); font-size: 0.92rem; }
.about__card-date { color: var(--text-faint); font-family: var(--font-mono); font-size: 0.8rem; margin-top: 8px; }
.about__tag-list li {
  display: inline-block;
  background: rgba(76,158,255,0.1);
  color: var(--accent);
  font-size: 0.8rem;
  padding: 6px 12px;
  border-radius: 999px;
  margin: 0 6px 6px 0;
}

/* ============================================================
   SKILLS
============================================================= */
.skills__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.skills__col-title { font-size: 1rem; color: var(--text); margin-bottom: 22px; font-weight: 600; }
.skill-bar { margin-bottom: 18px; }
.skill-bar__label {
  display: block;
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.skill-bar__track {
  width: 100%;
  height: 6px;
  background: var(--surface-2);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}
.skill-bar__fill {
  height: 100%;
  width: 0%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 1.4s var(--ease);
}
.skill-bar__pct {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  float: right;
  margin-top: 4px;
}

/* ============================================================
   ARCHITECTURE / PIPELINE
============================================================= */
.architecture__intro { color: var(--text-muted); max-width: 720px; margin-bottom: 48px; font-size: 1.02rem; }
.pipeline {
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  padding: 20px 0 30px;
  scrollbar-width: thin;
}
.pipeline__node {
  flex: 0 0 auto;
  width: 150px;
  text-align: center;
  padding: 20px 12px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--surface);
  opacity: 0.45;
  transform: scale(0.94);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease), border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}
.pipeline__node.is-active {
  opacity: 1;
  transform: scale(1);
  border-color: var(--accent);
  box-shadow: 0 0 0 1px rgba(76,158,255,0.3), 0 12px 30px -12px rgba(76,158,255,0.5);
}
.pipeline__icon { font-size: 1.8rem; margin-bottom: 10px; }
.pipeline__label { font-weight: 600; font-size: 0.9rem; margin-bottom: 4px; }
.pipeline__sub { font-size: 0.72rem; color: var(--text-faint); font-family: var(--font-mono); }
.pipeline__arrow {
  flex: 0 0 auto;
  width: 34px; height: 2px;
  background: linear-gradient(90deg, var(--border-strong), transparent);
  position: relative;
}
.pipeline__arrow::after {
  content: '';
  position: absolute;
  right: 0; top: 50%;
  width: 6px; height: 6px;
  border-right: 1.5px solid var(--border-strong);
  border-bottom: 1.5px solid var(--border-strong);
  transform: translateY(-50%) rotate(-45deg);
}
.architecture__note {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-faint);
  border-left: 2px solid var(--accent-2);
  padding-left: 16px;
}

/* ============================================================
   EXPERIENCE TIMELINE
============================================================= */
.timeline { position: relative; padding-left: 32px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 5px; top: 6px; bottom: 6px;
  width: 1.5px;
  background: var(--border);
}
.timeline__item { position: relative; margin-bottom: 28px; }
.timeline__marker {
  position: absolute;
  left: -32px; top: 30px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(76,158,255,0.18);
}
.timeline__card { padding: 28px 32px; }
.timeline__header { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 10px; margin-bottom: 6px; }
.timeline__role { font-size: 1.15rem; font-weight: 600; }
.timeline__date { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent-2); }
.timeline__company { color: var(--text-muted); margin-bottom: 16px; font-weight: 500; }
.timeline__list li {
  position: relative;
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 0.94rem;
  margin-bottom: 10px;
}
.timeline__list li::before {
  content: '';
  position: absolute;
  left: 0; top: 9px;
  width: 6px; height: 6px;
  background: var(--accent-2);
  border-radius: 2px;
}

/* ============================================================
   PROJECTS
============================================================= */
.projects__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.project-card { padding: 28px; display: flex; flex-direction: column; }
.project-card__image {
  width: 52px; height: 52px;
  border-radius: 14px;
  background: var(--surface-2);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 20px;
}
.project-card__title { font-size: 1.05rem; margin-bottom: 12px; font-weight: 600; }
.project-card__desc { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 14px; flex-grow: 1; }
.project-card__arch {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent-2);
  margin-bottom: 16px;
}
.project-card__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.project-card__tags span {
  font-size: 0.72rem;
  padding: 5px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  color: var(--text-faint);
}

/* ============================================================
   CERTIFICATIONS
============================================================= */
.cert__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 24px; }
.cert-card { padding: 28px; text-align: center; }
.cert-card__icon { font-size: 2rem; margin-bottom: 14px; }
.cert-card__title { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.cert-card__sub { color: var(--text-faint); font-size: 0.85rem; font-family: var(--font-mono); }

/* ============================================================
   RESUME
============================================================= */
.resume__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  background: linear-gradient(135deg, rgba(76,158,255,0.08), rgba(125,224,196,0.05));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
}
.resume__desc { color: var(--text-muted); margin-top: 10px; max-width: 440px; }
.resume__actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ============================================================
   CONTACT
============================================================= */
.contact__grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 32px; align-items: start; }
.contact__form { padding: 36px; }
.form__row { margin-bottom: 20px; display: flex; flex-direction: column; gap: 8px; }
.form__label { font-size: 0.85rem; color: var(--text-muted); }
.form__input {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  color: var(--text);
  font-size: 0.95rem;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.form__input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(76,158,255,0.15);
  outline: none;
}
.form__input.is-invalid { border-color: var(--danger); }
.form__textarea { resize: vertical; min-height: 120px; }
.form__error { color: var(--danger); font-size: 0.78rem; min-height: 1em; }
.form__submit { width: 100%; position: relative; margin-top: 6px; }
.form__spinner {
  display: none;
  width: 16px; height: 16px;
  border: 2px solid rgba(6,16,33,0.3);
  border-top-color: #061021;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.form__submit.is-loading .form__submit-text { opacity: 0.6; }
.form__submit.is-loading .form__spinner { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }
.form__status {
  margin-top: 14px;
  font-size: 0.88rem;
  min-height: 1.2em;
}
.form__status.is-success { color: var(--success); }
.form__status.is-error { color: var(--danger); }

.contact__side { display: grid; gap: 18px; }
.contact__card { padding: 26px; }
.contact__card-title { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--accent); margin-bottom: 12px; }
.contact__card p { color: var(--text-muted); margin-bottom: 6px; font-size: 0.92rem; }
.contact__card a:hover { color: var(--accent-2); }
.contact__card-sub { font-size: 0.88rem; }

/* ============================================================
   FOOTER
============================================================= */
.footer { border-top: 1px solid var(--border); padding: 48px 32px 32px; }
.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.footer__tag { color: var(--text-faint); font-size: 0.85rem; margin-top: 6px; }
.footer__social { display: flex; gap: 22px; }
.footer__social a { color: var(--text-muted); font-size: 0.9rem; transition: color 0.2s; }
.footer__social a:hover { color: var(--accent-2); }
.footer__copy { width: 100%; text-align: center; color: var(--text-faint); font-size: 0.78rem; margin-top: 20px; }

/* ============================================================
   BACK TO TOP
============================================================= */
.back-to-top {
  position: fixed;
  bottom: 28px; right: 28px;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--border-strong);
  color: var(--accent);
  font-size: 1.1rem;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0.3s var(--ease);
  z-index: 90;
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { border-color: var(--accent); }